Lithium niobate is an optically active inorganic crystal, widely used in optical and electronic devices. It is a ferroelectric material with a wide range of use in optical communication, optical computing, and optical sensing. This crystal has excellent electro-optic, acousto-optic, and nonlinear optical properties, making it ideal for many applications. It is also used in laser crystals, optical modulators, and electro-optic deflectors. Additionally, its piezoelectric properties allow it to be used in transducers, acoustic wave filters, and surface acoustic wave devices.